Comb-like or side chain architecture

Stilbazole (6b) with n = 2, which has a shorter axial length than (6a) and possesses no mesophase it also displays a smectic mesophase (A or C) when complexed with the siloxane copolymers, although with lower clearing temperatures than the complexes with stilbazole (6a) (and with no dependence on thermal history) but higher than the 

In still another variation, a chiral or optically active stilbazole (6c), which by itself displays no mesophase, was complexed with the polysiloxane-based polymers [18]. Again, mesomorphicity was obtained, with the usual effects on the transition temperatures (which are, once more, broad and dependent on thermal history). No glass transitions were detected. X-ray data indicate that the mesophase is smectic C, 

This family of noncovalently bonded PLCs may also include polyelectrolyte + surfactant complexes which, as will be seen, can also give rise to liquid crystalline mesophases. In these complexes there is only a flexible alkyl chain attached to the ionic head group in the small molecule constituent, with no rigid aromatic core present. Since surfactants themselves are frequently thermotropic liquid crystals, it is not surprising that their complexes with polyelectrolytes may produce PLCs, in both cases driven by the incompatibility between the ionic and aliphatic parts leading to amphitropic systems [27]. 

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Hydrogen bonded PLC structures 3.2.2 Comb-like or side chain architecture... 

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